mmHg
What is a millimeter of mercury?
The medical pressure unit — blood pressure and vacuum specs
Definition
The millimetre of mercury equals about 133.3 Pa — the pressure exerted by a 1 mm column of mercury at 0 °C under standard gravity. Traditionally and still used in medicine: blood pressure of 120/80 mmHg.
Common uses
- Blood pressure measurement globally
- Vacuum-system specifications
- Historical scientific texts
🌍 Real-world scale
Normal blood pressure: 120/80 mmHg. Atmospheric: 760 mmHg. Good vacuum: <1 mmHg.
Convert from millimeters of mercury
9 conversionsMillimeter of Mercury to Pascal1 mmHg = 133.322 PaMillimeter of Mercury to Kilopascal1 mmHg = 0.1333 kPaMillimeter of Mercury to Megapascal1 mmHg = 0.0001333 MPaMillimeter of Mercury to Bar1 mmHg = 0.001333 barMillimeter of Mercury to Millibar1 mmHg = 1.33322 mbarMillimeter of Mercury to Pound per Square Inch1 mmHg = 0.01934 psiMillimeter of Mercury to Atmosphere1 mmHg = 0.001316 atmMillimeter of Mercury to Torr1 mmHg = 1 TorrMillimeter of Mercury to Inch of Mercury1 mmHg = 0.03937 inHg
Convert to millimeters of mercury
9 conversionsPascal to Millimeter of Mercury1 Pa = 0.007501 mmHgKilopascal to Millimeter of Mercury1 kPa = 7.50062 mmHgMegapascal to Millimeter of Mercury1 MPa = 7,500.62 mmHgBar to Millimeter of Mercury1 bar = 750.062 mmHgMillibar to Millimeter of Mercury1 mbar = 0.7501 mmHgPound per Square Inch to Millimeter of Mercury1 psi = 51.7149 mmHgAtmosphere to Millimeter of Mercury1 atm = 760 mmHgTorr to Millimeter of Mercury1 Torr = 1 mmHgInch of Mercury to Millimeter of Mercury1 inHg = 25.4 mmHg
Tips
- 1 mmHg ≈ 133.32 Pa ≈ 1 Torr.
- 760 mmHg = 1 atm.
- Blood-pressure cuffs display mmHg worldwide.
Common mistakes
- Confusing mmHg with mmH₂O (different unit, factor of 13.6).
- Mixing mmHg with torr in precise vacuum physics — they differ by one part per million.
- Writing blood pressure in kPa — use mmHg for medical continuity.
FAQ about the millimeter of mercury
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